Thermostatic valve for carburetors



Apr. 24, 1923.-

F. o. LEWIS THERMOSTATIC VALVE FOR GARBURETORS- Filed Aug. 3,1, v1921 Patente-d Apr. 2d, N23.

einen arras ration encreur oratori- FRE'DERICK 40. LEWSA, 0F DAYTN; OHO,\.SSIG`NR 0F ONE-HLF T0 SCARB. y

. REEMELIN, F DAKWOOD, OHIO.

THRMOSTATIC VALVE FR.v CARBUBETORS.'

application and August 31, ieai. seri-a1 in. cernes.

To all whom it may concern:

Be it known that L FREDERICK 0; Lnwrs, a citizen of the United States, residing 1n the city of Dayton, in the county of Montgomery andState of Ohio, have inventedcally governed by the temperature of they motor. For example, when the motor becomes warmer, the valve will be depressed by an expansible element to reduce the slze of the oriice inthe carburetor through which the liquid fuel is drawn, making the mixture leaner; and when the motor` becomes.

cooler, the valve will be raised by thecontraction of said element to produce a richer mixture.

In the accompanying drawings, Figure l. lis a vertical sectional View of my thermostatic control applied to a carburetor of an explosive engine. And Figure 2 is avertical sectional View of the needle valve' controlling means.

Throughout the specification and drawings, similar reference characters denote corresponding parts. i

Referring to the accompanying drawings for -a detailed description of the preferred form of embodiment of my invention, the

numeral 1 designates a carburetor of a common type, having a liquid fuel discharge orifice 2 adapted to be opened and closed by the lower end of a needle valve 3.

The upper portion of theneedle valve 3 projects t from a cylindrical` member 5 whose upper end is open to receive the lower end of a non-expansible' tube 6 preferably constructed of porcelain. The up er end of this tube is closed by .a cylindrica cap 7 Contained within the tube 6 is. an elongated element 8 that is constructed of zinc or other material of a high co-ecient of expansion. To the lower endfof the elongated element 8 the upper end ofthe needle valve 3 is connected so that when expanded by heat, said element will force the needle valve 3 into the orifice 2 ofthe carburetor' to rerough a sleeve '4 that depends duce the amount of, liquid fuel drawn therethrough. y f

For the purpose of subjecting the expansibleI element 48 to the heat of the engine, the tube 6 is enclosed in a piece of :flexible tubing 9. The lower end of this tubing is received by a T 10 that rests upon the top of the closure portion 11 of the carburetor. lThis T is firmly secured to the latter by a bracing extension l12 that is bolted to the lange 13 on the carburetor mixture outlet 14. When the T is so applied to the carburetor, the sleeve 4 will project a suicient distance through the closure member 11 to permit the lower end of the needle valve 3 to be' moved into they oririce 2 by the expansibie element .8.

Communication `is established between the vlateral tubular portion 15 of the T 10 and the air inlet portion 16 of the carburetor, by

la readily insertible bend 17, through which heated air that is delivered to the flexible tubing 9 as follows.

The top portion 'of the exible tubing 9 isa received by a bend 18 whiohis connected f to,and communicates with, an elongated hot air collecting member 19 that rests upon the exhaust pipe 20 of the explosiveengine (notv shown). Y Part of the air' heated under the member 19/by the exhaust pipe 20, will pass through the lexible tubing 9, T lO'and bendl 17, into the air inlet 16 of the carburetor. Since the tube 6 is within the flexible tubing t), the heated air passing through the latter will cause the element 8 within the tube 6 to expand in proportion to 'the rise in temperature of this air. When it expands, the element 8 will press the needle valve 3 into the orifice 2 to reduce the amount vof liquid fuel discharged therefrom; and when it oontracts, thel said element will raise the needle lvalve above the orifice to permit a larger amount of liquid fuel to be Idrawn there-t from. It is thus seen that the carburetted mixture may be automatically made richer or leaner in proportion to the variation in temperature of the explosive engine.

, I `do not wish to be limited to the details of construction and arrangement Iherein shown and described,l and any changes or modiication's may be made therein vWithin the scopefof the subjoined claim.

Having described my'invention, I claim:v in said tubular support, connected to the In adevice of the type described, the comneedle va1ve,'for the purpose specified. 10 bination with a carburetor having a liquid- In testimony whereof I have hereunto set fuel dilhargle olrifice, of a nedle Valve for my hand this 30th day of August, 1921. 5 contro 1n t 1e atter, an air eater, an air conduit legading from the heater to the car- FREDERCK 0 LEWIS buretor, a tubular support projecting into- Witness: said air conduit, andan expansible element HOWARD S. SMITH. 

